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WO1994007321A1 - Lignes privees communes partagees permettant a plusieurs entreprises telephoniques de desservir le meme client - Google Patents

Lignes privees communes partagees permettant a plusieurs entreprises telephoniques de desservir le meme client Download PDF

Info

Publication number
WO1994007321A1
WO1994007321A1 PCT/US1993/008778 US9308778W WO9407321A1 WO 1994007321 A1 WO1994007321 A1 WO 1994007321A1 US 9308778 W US9308778 W US 9308778W WO 9407321 A1 WO9407321 A1 WO 9407321A1
Authority
WO
WIPO (PCT)
Prior art keywords
carrier
telephone
house
wiring circuit
secondary carrier
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/US1993/008778
Other languages
English (en)
Inventor
Paul Baran
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Com 21 Inc
Original Assignee
Com 21 Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Com 21 Inc filed Critical Com 21 Inc
Priority to EP93921641A priority Critical patent/EP0663127B1/fr
Priority to DE69331328T priority patent/DE69331328T2/de
Publication of WO1994007321A1 publication Critical patent/WO1994007321A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/71—Substation extension arrangements
    • H04M1/715—Substation extension arrangements using two or more extensions per line
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q3/00—Selecting arrangements
    • H04Q3/58—Arrangements providing connection between main exchange and sub-exchange or satellite
    • H04Q3/62—Arrangements providing connection between main exchange and sub-exchange or satellite for connecting to private branch exchanges
    • H04Q3/625—Arrangements in the private branch exchange

Definitions

  • the present application is related to an application by the same inventor entitled "DIGITAL TELEPHONE, CABLE TV SYSTEM AND LOCAL EXCHANGE BYPASS NETWORK" filed on September 17, 1991, and given serial number 07/761,281 and assigned to the same assignee.
  • Field of the Invention The present invention relates to equipment that allows two or more competing alternative telephone carriers to serve the same customer using the customer's existing in-house telephone wiring without interference from one telephone carrier's system to the other's. Background of The Invention:
  • Service is normally provided by a primary carrier that serves on a default basis.
  • a telephone user dialing a prefix code selects the carrier to be used.
  • Switching arrangements insure that one and only one carrier is connected to the user's telephone wiring at any one time. Incoming calls from multiple independent carriers can be answered using the existing in-house wired telephones without modification.
  • Figure 1 is a block diagram of the overall connections between the carriers and the inter-structure wiring.
  • FIG. 2 is a block diagram showing details of the implementation of the Primary Carrier Interface Unit (PCIU) and the Secondary Carrier Interface Unit (SCIU) modules of the present invention.
  • PCIU Primary Carrier Interface Unit
  • SCIU Secondary Carrier Interface Unit
  • the present invention is made possible by alternative telephone technologies that are becoming available which do not require new wiring.
  • One of these advances is short range cordless telephones that can be interfaced with a cable TV system serving as a bi ⁇ directional transmission path.
  • Such technology allows the creation of an alternative telephone carrier that bypasses the current local exchange system, without the past necessity for new wires to the home.
  • the present invention provides the necessary hardware to make multiple use of existing telephone wiring within a structure to allow two or more different alternative telephone systems to coexist without the need to rewire each structure since te;ephone equipment and wiring within the house are considered the property of the home owner.
  • a telephone central office supplies operating pov/er for the individual telephone instruments, as well as, monitoring current flow to determine when a telephone is off-hook, providing a dial tone and a high voltage ringing signal to inform the user of an incoming call.
  • An alternative carrier will also have to provide such capabilities as well.
  • the present invention allows the customer a choice of competing telephone systems while using the same telephone and telecommunication instruments connected to the same telephone wiring within the structure. In providing that choice to the consumer the present invention also prevents undesirable interactions from taking place between the two or more telephone systems.
  • a first module is placed at the first, or primary carrier's, demarcation block, and a second module is placed at each of the secondary carriers' demarcation blocks.
  • the "demarcation block” is the boundary between a telephone company's wiring and the customer's owned “in- house” or premises wiring and customer provided equipment (CPE) .
  • CPE customer provided equipment
  • Telephone service is currently supplied by a single carrier, and for purposes of discussion in this specification that service will be referred to as being supplied by the "primary telephone carrier".
  • the primary telephone carrier is initially assumed to be of the twisted-copper-wire-to-the-central-office type.
  • the new carrier, or carriers, which the present invention will support are each assumed to use a cable TV system as a bi ⁇ directional transmission path and for purposes of discussion here is called the "secondary carrier". More than one secondary carrier could be supported, but for clarity of discussion, only one primary and one secondary carrier is described here in detail.
  • PCIU 22 is mounted at the demarcation line between the primary carrier lines 24 to provide an interface between those lines and the customer's in-house wiring 10.
  • SCIU 26 is mounted at the point of demarcation line between the secondary carrier lines 28 and the customer's in-house wiring 10.
  • Access to the secondary carrier will generally be by cable or radio means.
  • the secondary carrier demarcation point occurs at a modular telephone jack at a TV set top converter unit connected to the cable TV drop cable, which serves as part of the secondary carrier's transmission path.
  • the secondary carrier Interface Unit (SCIU) 26 could be contained within the cable TV set top unit.
  • FIG 2 illustrates the internal components of both PCIU 22 and SCIU 26. Since it is necessary to prevent interference between carriers it is necessary that one, and only one, carrier be connected to in-house wiring 10 at any one time. To accomplish this, each of PCIU and SCIU include relay switches 30 and 50, respectively. In Figure 2, PCIU switches 30 are shown as normally closed and SCIU switches 50 are shown as normally open. As will be described below, when the subscriber selects to be connected to the secondary carrier, switches 30 are remotely opened before switches 50 are remotely closed. The break-before-make configuration is necessary to insure that both carriers are not connected to the in-house wiring at the same time thus preventing the shorting out of the voltage level provided by the primary carrier.
  • the preselected subscriber entered signals for selecting the use of the secondary carrier might be #8 entered via the keypad of one of telephone sets 12-20. If there are additional secondary carriers available to the subscriber they might be selected by entry of #7, or perhaps #81, or other combination not normally encountered as a present valid dialing combination.
  • Code #9 might be used connect the primary carrier to the in- house wiring 10. However, as will be discussed below the primary carrier will normally be connected to in-house wiring 10 when ever the system is in the standby mode or when the subscriber is using the primary carrier, the subscriber will not have to enter that code to connect in- house wiring 10 to the primary carrier.
  • PCIU 22 Any of the codes that are discussed above that are transmitted via in-house wiring 10 will be received by PCIU 22 and to one or more SCIUs 26 that are connected to in-house wiring 10. Thus, as described above, PCIU 22 will open relay switches 30 when it receives a code for any of the secondary carriers.
  • the primary carrier is generally the normal Public Switched Telephone System (PSTN) . As such, the primary carrier provides a dc operating voltage plus high voltage ringing signals.
  • PSTN Public Switched Telephone System
  • the primary carrier provides a dc operating voltage plus high voltage ringing signals.
  • PCIU 22 is shown with a power line module 44 that is connected to primary carrier telephone lines 24 to generate the necessary voltage levels to power the other components of PCIU 22.
  • PCIU 22 The purpose of PCIU 22 is to control relay switches 30 so that they are opened only when the subscriber is connected to a secondary carrier.
  • a relay coil 32 for controlling the opening and closing of switch contacts 30 under the control of relay driver 34.
  • a DTMF (dual tone multiple frequency) detector 42 e.g. Silicon Systems DTMF Receiver SS157T202
  • a DTMF unit is shown in use here.
  • the system of the present invention could also be implemented using the earlier pulse technology or by placing a pulse detector in parallel with the DTMF detector to interface with the older equipment as well.
  • the signals received by DTMF detector 42 are decoded and presented to a logic device 36 as standard logic type signals.
  • a coded pattern signal received from DTMF detector 42 processed by logic device 36 operates power relay driver 34 to cause switch contacts 30 to change position. This coded pattern causes the disconnection of the primary carrier from in-house wiring 10.
  • the end of a telephone call via the secondary carrier is detected by off-hook detector 35, which causes the reconnection of the primary carrier to in-house wiring 10.
  • signaling means other than DTMF could be used in this application with similar results.
  • SCIU 26 is shown connected to in-house wiring 10 by means of a modular jack 74, which is internally connected directly to one side of switches 50.
  • SCIU 26 could be part of a set-top cable TV unit that is connected to the incoming cable from the cable service. That cable has the capacity to handle bi-directional communications using one part of the cable's spectrum for upstream telephone siganls and the remainder of the spectrum for downstream transmission for both TV signals and telephone sigansl on suitable carriers (not shown) .
  • SCIU 26 iinterfaces to the secondary carrier 28 the TV set-top unit (not shown) to the TV cable system.
  • a second cable which is a standard telephone type cable, is connected between modular jack 74 on the TV set-top unit and a telephone jack in an interior wall of the structure in the same way as one would connect an extension telephone today.
  • SCIU 26 includes a mains driven power supply 76 that is connected to the subscriber's electrical utility power line.
  • an integrated circuit chip 72 Connected on the other side of switches 50 from modular jack 74 is an integrated circuit chip 72 to provide the functionality needed to support the PSTN telephone sets 12-20.
  • This chip could be implemented by a Texas Instruments Subscriber Line Control Circuits chip TCM4204A (a complete description of the features and operation of that chip is available in Texas Instruments Telecommunications Circuit Data Book, Linear Products, 1991, pp. 4-107 to 4-131) .
  • the SLCC chip 72 provides the necessary services to support telephone off-hook supervision, electronic hybrid function, signal conditioning, over-voltage protection, battery feed, and ringing control.
  • the secondary carrier can be provided either as a "two-wire” or a "four-wire” connection in which the sending and receiving paths share the same wires.
  • the "four wire" configuration will be used (as shown in Fig. 2) with the received and transmitted signals being carried by lines 82 and 84, respectively, between the secondary carrier lines 28 and SLCC chip 72.
  • those signals are converted bi-directionally by an internal electronic hybrid to interface with the two wire in-house wiring 10 for use with existing telephone sets 12-20.
  • Ringing initiation can be sent ⁇ received on either the receive/transmit pair 82-84, or on separate ringing signal and signaling lines 80 and 86 via microcontroller 56 and lines 96 and 94, respectively, which are connected between microcontroller 56 and SLCC chip 72. On these lines a coded pattern corresponding to the desired ringing signal is transmitted.
  • SLCC chip 72 is the conduit between the secondary carrier and the in- house wiring 10 for in-coming and out-going telephone calls.
  • the secondary carrier is connected to the in- house wiring 10 only under two conditions. One, when an in-coming call is being received from the secondary carrier and the in-house wiring 10 is not already busy with another call from the primary carrier or any other carrier, and two, when the subscriber elects to make an out-going call on the secondary carrier.
  • SCIU 26 checks for an off- hook condition.
  • the in-house wiring 10 line voltage drops from the normal 48 volts when the receiver is on-hook to only a few volts.
  • SLCC chip 72 is connected to the extension of the in-house wiring 10 between modular jack 74 and switches 50 to allow a supervisory connection within SLCC chip 72 to monitor the voltage level on in-house wiring 10 and to sense the low voltage off-hook condition.
  • SLCC chip 72 in response, generates an off-hook signal which is delivered to microcontroller 56 via line 94 to prevent microcontroller 56 from sending a relay activation signal to relay driver 54 on line 98 to change the state of switches 50 as long as the off-hook condition exists unless the subscriber has also selected the secondary carrier.
  • an off-hook voltage level appears on in-house wiring 10. This off-hook voltage level is sensed in the same way as in the condition of the previous paragraph by SLCC chip 72 and microcontroller 56 is blocked from sending a signal to relay driver 54 to change the state of switches 50.
  • microcontroller 56 sends a signal to relay driver 54 to open switches 50.
  • a signal to open switches 50 could be sent to relay driver 54 even if switches 50 are already open.
  • Microcontroller 56 can be implemented by a device such as a Motorola 68HC04, or equivalent.
  • a bi-directional hybrid 62 Also connected to the extension of in-house wiring 10 within SCIU 26 between modular jack 74 and switches 50 is a bi-directional hybrid 62.
  • hybrid 62 In communication with hybrid 62 are two other modules, a DTMF receiver 68 to monitor subscriber entered codes via one of telephone sets 12-20 and hybrid 62, and a DTMF generator 64 for generating tones to be placed on in-house wiring 10 via hybrid 62 and modular jack 74 to be sent to PCIU 22.
  • a DTMF receiver 68 to monitor subscriber entered codes via one of telephone sets 12-20 and hybrid 62
  • a DTMF generator 64 for generating tones to be placed on in-house wiring 10 via hybrid 62 and modular jack 74 to be sent to PCIU 22.
  • DTMF receiver 68 monitors the touch-tone signals on in-house wiring 10 in the same way that DTMF receiver 42 in PCIU 22 does and then converts those signals to logic signals that microcontroller 56 can use. For example, when the touch-tone signal on in-house wiring 10 entered by the subscriber is the code to select the primary carrier (this could happen however, as stated above, connection to the primary carrier is the normal condition and it should not be necessary for the subscriber to make that selection) , or a different secondary carrier, microcontroller 56 will send a signal to relay driver 54 to open switches 50.
  • microcontroller 56 is programmed to recognize the code that corresponds to the secondary carrier to which it is connected. Once that recognition is registered, microcontroller 56 awaits an off-hook signal on line 94 from SLCC chip 72 before instructing relay driver 54 to close switches 50. An off-hook signal is detected by SLCC chip 72 here jafter PCIU 22 causes switches 30 to open.
  • the voltage level on in-house wiring 10 by virtue of its connection to - li ⁇ the primary carrier is approximately 48 volts, and after switches 30 open in-house wiring 10 is not connected to any voltage source and in essence floating with no current flowing. The absence of a current flow results in SLCC chip 72 reading the voltage level on in-house wiring 10 as zero, thus assuming that there is an off-hook condition.
  • Microcontroller 56 first triggers DTMF generator 64 to generate the tone that the subscriber would enter to select the secondary carrier to which SCIU 26 is connected. That tone is then applied to in-house wiring 10 via hybrid 62 and modular jack 74 so that it can be detected by DTMF receiver 42 of PCIU 22 so that it will open switches 50 as if the subscriber had entered the code for the secondary carrier. Switches 30 are then opened and switches 50 are closed by the same mechanism that was described above when the subscriber entered the appropriate code for the secondary carrier.
  • SCIU 26 easily lends itself to this technology.
  • packetized signals received on line 80 can be depacketized by microcontroller 56 for use on in-house wiring 10 by the conventional telephone sets 12-20, or signals to be transmitted on the secondary carrier can be packetized by microcontroller 56 prior to being placed on out-going line 86.

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Astronomy & Astrophysics (AREA)
  • General Physics & Mathematics (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Telephonic Communication Services (AREA)
  • Sub-Exchange Stations And Push- Button Telephones (AREA)

Abstract

L'invention se rapporte à un système qui permet de raccorder automatiquement au moins deux entreprises téléphoniques à des lignes téléphoniques privées existantes (10). Le choix de l'entreprise est fait par le demandeur. Le service est assuré, par défaut, par une entreprise principale (24), toutefois, l'utilisateur peut sélectionner et provoquer la connexion d'une entreprise alternative aux lignes privées, permettant d'utiliser un équipement téléphonique standard (12-20) avec différentes entreprises selon le choix du demandeur. Dans ce système, l'agencement de commutation est tel que seule une entreprise est raccordée aux lignes privées à un instant donné. De plus, on assure la détection des appels entrants provenant des entreprises autres que l'entreprise principale par défaut et la commutation à cette entreprise en réponse à l'appel entrant. En outre, ce système permet le groupage par paquets des informations entrantes et la réception des informations entrantes groupées par paquets sur l'entreprise secondaire (28) avec l'équipement téléphonique standard qui est connecté aux lignes privées.
PCT/US1993/008778 1992-09-22 1993-09-16 Lignes privees communes partagees permettant a plusieurs entreprises telephoniques de desservir le meme client Ceased WO1994007321A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP93921641A EP0663127B1 (fr) 1992-09-22 1993-09-16 Lignes privees communes partagees permettant a plusieurs entreprises telephoniques de desservir le meme client
DE69331328T DE69331328T2 (de) 1992-09-22 1993-09-16 Verteilte gemeinsame hausinterne anlage, die mehreren fernsprechanbietern erlaubt den gleichen teilnehmer zu bedienen

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US07/949,424 US5341415A (en) 1992-09-22 1992-09-22 Method and apparatus for sharing of common in-house wiring to permit multiple telephone carriers to serve the same customer
US07/949,424 1992-09-22

Publications (1)

Publication Number Publication Date
WO1994007321A1 true WO1994007321A1 (fr) 1994-03-31

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PCT/US1993/008778 Ceased WO1994007321A1 (fr) 1992-09-22 1993-09-16 Lignes privees communes partagees permettant a plusieurs entreprises telephoniques de desservir le meme client

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Country Link
US (1) US5341415A (fr)
EP (1) EP0663127B1 (fr)
CA (1) CA2144954A1 (fr)
DE (1) DE69331328T2 (fr)
WO (1) WO1994007321A1 (fr)

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Also Published As

Publication number Publication date
EP0663127B1 (fr) 2001-12-12
DE69331328D1 (de) 2002-01-24
EP0663127A4 (fr) 1995-09-27
DE69331328T2 (de) 2002-08-14
EP0663127A1 (fr) 1995-07-19
CA2144954A1 (fr) 1994-03-31
US5341415A (en) 1994-08-23

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